1. European Southern Observatory - Instrumentation Division
A ultra low photon background 1 to 5 micron detector mosaic test facility Reinhold J. Dorn, S. Eschbaumer, G. Finger, J. P. Kirchbauer, L. Mehrgan, M. Meyer, A. Silber and J. Stegmeier
European Southern Observatory - Instrumentation Division
12/29/2018

2. Design of the test facility
Cryogenic blackbody with the epoxy spiders and heating resistors
Detector mosaic facing down looking inside the structure. The cryogenic preamplifiers and the cold braid connection are shown.
Filterwheel with J, H, K, L, M filters
12/29/2018

3. IR detector mosaic testfacility
Functionality and cryogenic performance of the detector system
Optimization of feedtroughs and radiation shielding
Darkcurrent and readnoise for very low flux applications
Cosmetic quality, uniformity and electroluminescence
Quantum efficiency in J, H, K, L and M
Analog bandwidth of the video output
Measurement of instrumental photon background
Photon transfer curve and calibration
12/29/2018

4. The CRIRES and Hawk-I focal plane mosaics
Applications:
The CRIRES and Hawk-I focal plane mosaics
The first application for the testfacility was the CRIRES 512 x 4096 pixels Aladdin InSb focal plane array mosaic the newly developed 3-side buttable package as seen on the right side.
The second application for the new testfacility is the Hawk-I detector mosaic with four 2kx2k Rockwell HgCdTe MBE buttable arrays with 2.5µm cut-off. GL Scientific is providing the packaging and mount.
12/29/2018

5. Examples of Results
Some results obtained with the CRIRES detectors are shown below as an example.
Comparison of efficiency corrected for cos4 dependence of illumination and different conversion gains
Photon transfer curve for an Aladdin array
Map of efficiency of CRIRES mosaic with pinhole grid mask
12/29/2018